gnugrep
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grep is a command-line utility for searching plain-text data sets for lines that
match a regular expression. Its name comes from the ed command g/re/p (globally
search for a regular expression and print matching lines), which has the same
effect. grep was originally developed for the Unix operating system, but later
available for all Unix-like systems and some others such as OS-9. [0]

Upstream: https://www.gnu.org/software/grep/


[000] Index
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* Installation ........................................................... [001]
* Setup .................................................................. [002]
* Usage .................................................................. [003]
* References ............................................................. [004]


[001] Installation
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+------------------------------------------------------------------------------+
|                                                                              |
|  $ kiss b gnugrep                                                            |
|                                                                              |
+------------------------------------------------------------------------------+


[002] Setup
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To use GNU grep as the system grep, the alternatives system must be used. The
GNU grep implementation is very fast [1] and is recommended over the default
provided by busybox.

+------------------------------------------------------------------------------+
|                                                                              |
|  $ kiss a gnugrep /usr/bin/grep                                              |
|  $ kiss a gnugrep /usr/bin/egrep                                             |
|  $ kiss a gnugrep /usr/bin/fgrep                                             |
|                                                                              |
+------------------------------------------------------------------------------+

To undo these changes run 'kiss a', find the relevant output and run the
corresponding commands. Each line of output from 'kiss a' is a valid command
to give back to 'kiss a'.


[003] Usage
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Refer to the manual pages and command help output.


[004] References
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[0] https://en.wikipedia.org/wiki/Grep
[1] https://lists.freebsd.org/pipermail/freebsd-current/2010-August/019310.html